Two grid setup methods are available. Choose the method that is appropriate for your model, noting the restrictions in Section
9.3.1.

If the boundary between two zones that are in different reference frames is conformal (i.e., the grid node locations are identical at the boundary where the two zones meet), you can simply create the grid as usual, with all cell zones contained in the same grid file. A different cell zone should exist for each portion of the domain that is modeled in a different reference frame. Use an
interior zone for the boundary between reference frames.

If the boundary between two zones that are in different reference frames is non-conformal (i.e., the grid node locations are
not identical at the boundary where the two zones meet), follow the non-conformal grid setup procedure described in Section
5.4.3.